I don't use RTV when installing headers. If you read posts by me, you'll see I dislike the mention of doing it. Get clamps from FrozenBoost.com instead of the ones they give you and one trick.. when putting the crossover/front on, leave the cross over loose and tap the headers at the front/crossover connection area as you tighten the bolts for the front. That'll seat things nicely.
I don't accept leaks from headers. There's no reason to.![]()